condition mean min max ZT0-3 12.05333 11.43899 12.7028 ZT4-7 11.266255000000001 11.266255000000001 11.266255000000001 ZT8-11 4.27003 4.27003 4.27003 ZT12-15 4.131354 3.492803 4.769905 ZT16-19 2.55785 2.55785 2.55785 ZT20-23 6.18234 6.18234 6.18234